Thomas B. Tan, MD
Hematology & Oncology Physician · Lake St Louis, MO
Thomas B. Tan, MD is a hematology & oncology physician with a practice address in Lake St Louis, Missouri, and NPI 1275528382, issued on Sep 14, 2005. Check the license (Missouri 2020008924, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Thomas B. Tan
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License numbers
- 2020008924 MO
17614 AL
62467 FL
MD221267 OR
H2823 TX
Self-reported in NPPES; status is on the state search - Practice location
- 400 Medical Plz Ste 100, Lake St Louis, MO 63367
- Phone
- (636) 639-8600
- Enumerated
- Sep 14, 2005
- Record last updated
- Mar 3, 2025
- Medicaid ID
- 371163300 FL
- Medicare enrollment
- Enrolled (PECOS I20250210003469); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 237 in Missouri → Look up another NPI →
Also registered at 400 Medical Plz Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- John Bedwinek, MDRadiation Oncology Physician1952367740
- Yu Chen, M.D.Radiation Oncology Physician1740501014
- Rigoberto De Jesus PizarroHematology & Oncology Physician1922551167
- Stephanie Ohmes, RNNurse Practitioner1558243634
- Julie Scott, MSN ANPNurse Practitioner1962715649
- Kristen Strasser, M.D.Hematology & Oncology Physician1497071971
Verify Thomas B. Tan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2020008924Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
50% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
438 Medicare Part D claims for 163 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims. 13 claims were for opioids.
Most prescribed
- Prochlorperazine Maleate37 claims
- Prednisone25 claims
- Xarelto20 claims
- Eliquis19 claims
- Ondansetron Hcl18 claims
- Acyclovir12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Ssm Medical Group IncLake St Louis, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas B. Tan among 237 hematology & oncology physician records in Missouri
Thomas B. Tan, MD is one of 237 hematology & oncology physician records with a practice address in Missouri. 86% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 89% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated1986 · median 2003 among the 168 with a school on file
- Record last updated2025 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
5 hematology & oncology physician records list a practice address in Lake St Louis
They are 5 of the 264 NPPES records with a practice address in Lake St Louis, and 237 hematology & oncology physician records in Missouri.
All 237 in Missouri → Every provider in Lake St Louis → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Rigoberto De Jesus PizarroLake St Louis, MO 633671922551167
- Robert Kraetsch, MDLake St Louis, MO 633671609839281
- Kristen Strasser, M.D.Lake St Louis, MO 633671497071971
- John Wilkes, MDLake St Louis, MO 633671023071347
- Anna Roshal, MDSaint Peters, MO 633761124081799
- Arif Bari, M.D.Hannibal, MO 634011932188695
- Kevin Palka, MDHannibal, MO 634011689721482
- Jamshed Agha, MDSaint Charles, MO 633041720041395
Common questions
What is Thomas B. Tan, MD's NPI number?
Thomas B. Tan, MD's National Provider Identifier (NPI) is 1275528382, issued on Sep 14, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Thomas B. Tan, MD located?
The NPPES record lists a practice address at 400 Medical Plz Ste 100, Lake St Louis, MO, 63367. Phone: (636) 639-8600. Providers update this record themselves, so call before visiting.
How can I verify Thomas B. Tan, MD's license?
NPPES lists Missouri license number 2020008924, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Thomas B. Tan, MD prescribe under Medicare Part D?
In 2024, Thomas B. Tan, MD had 438 Medicare Part D claims for 163 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.